Path-Q Solar

How should a PPA be evaluated when the contract charges for a minimum amount of energy?

Answer

Treat the minimum energy charge as a contractual payment floor, whether or not the system produces or the customer uses that amount. Compare the minimum payment with expected production, actual usage, utility alternatives, and the PPA's escalation and termination terms.

Key points

  • Determine whether the minimum is measured monthly, annually, or over another period.
  • Calculate the effective price when actual production is below the minimum.
  • Check whether unused minimum energy carries forward or is forfeited.
  • Include fixed utility charges and any separate charges for energy above the minimum.

What it depends on

  • Minimum quantity and measurement period
  • PPA price and escalation
  • Production guarantee and downtime treatment
  • Customer load and utility bill structure

Risks and trade-offs

  • The customer may pay for energy not produced or not needed.
  • A minimum obligation can be especially costly after occupancy or usage falls.
  • A lower stated PPA rate may not represent the effective cost under the minimum.

Information you may need

  • PPA payment formula and minimum obligation
  • Carryforward, reconciliation, and curtailment terms
  • Production and degradation assumptions
  • Expected usage over the contract term

Your next step

What to do next

Calculate annual payments under low, expected, and high production and usage cases, including any unused-energy charges.

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